OGC API Registry Validator

A Python library for validating OpenAPI documents published by OGC API servers against OGC specification requirements.

Why This Library?

OGC API standards (Features, Tiles, Processes, Records, etc.) define specific requirements for the OpenAPI documents that servers must publish. These requirements include:

• Required endpoints (e.g., /collections, /conformance)
• Required HTTP operations (GET, POST, etc.)
• Conformance class declarations
• Response schemas and content types

This library performs static validation of these OpenAPI documents, helping you verify that your OGC API server's published specification meets the standard requirements before deployment.

Difference from OGC CITE Test Suite

Use both tools together:

1. ogcapi-registry → Fast feedback during development, catches specification errors early
2. OGC CITE → Full compliance certification, validates actual server responses

Development Workflow:
┌─────────────┐     ┌──────────────────┐     ┌─────────────┐
│ Write Code  │ --> │ ogcapi-registry  │ --> │  OGC CITE   │
│             │     │ (static check)   │     │ (runtime)   │
└─────────────┘     └──────────────────┘     └─────────────┘
      Fast              Seconds                 Minutes+

Features

• OGC API Validation: Validate against OGC API - Features, Tiles, Processes, Records, Coverages, EDR, Maps, Styles, Routes
• Conformance-Based Detection: Automatically detect API type from conformance classes
• Error Severity Levels: Distinguish between critical errors, warnings, and informational messages
• Extensible Strategy Pattern: Add custom validation strategies for new specifications
• Async Support: Full async/await support for high-performance validation

Installation

pip install ogcapi-registry

Or with uv:

uv add ogcapi-registry

Quick Start

Validating an OGC API Server

from ogcapi_registry import (
    OpenAPIClient,
    validate_ogc_api,
    parse_conformance_classes,
)

# Fetch the OpenAPI document from your server
client = OpenAPIClient()
openapi_doc, metadata = client.fetch("https://demo.pygeoapi.io/master/openapi")

# Parse conformance classes (usually from /conformance endpoint)
conformance_uris = [
    "http://www.opengis.net/spec/ogcapi-features-1/1.0/conf/core",
    "http://www.opengis.net/spec/ogcapi-features-1/1.0/conf/geojson",
    "http://www.opengis.net/spec/ogcapi-features-1/1.0/conf/oas30",
]
conformance_classes = parse_conformance_classes(conformance_uris)

# Validate against OGC API requirements
result = validate_ogc_api(openapi_doc, conformance_classes)

if result.is_valid:
    print("OpenAPI document is fully compliant!")
else:
    # Check error severity
    for error in result.critical_errors:
        print(f"CRITICAL: {error['message']}")

    for warning in result.warnings:
        print(f"WARNING: {warning['message']}")

Understanding Error Severity

The library classifies validation errors by severity:

from ogcapi_registry import ErrorSeverity

# Critical errors: Must be fixed for OGC compliance
result.critical_errors  # Missing required endpoints, wrong HTTP methods

# Warnings: Should be fixed but API may still function
result.warnings  # Missing recommended features like CRS support

# Info: Optional improvements
result.info_errors  # Missing optional features like filtering

# Check if API is compliant (no critical errors)
if result.is_compliant:
    print("API meets minimum OGC requirements")

Automatic API Type Detection

from ogcapi_registry import detect_api_types, get_primary_api_type

# Detect all API types from conformance classes
api_types = detect_api_types(conformance_classes)
# e.g., {OGCAPIType.FEATURES, OGCAPIType.TILES}

# Get the primary (most specific) API type
primary = get_primary_api_type(conformance_classes)
# e.g., OGCAPIType.FEATURES

Application Example: CI/CD Validation

Integrate OGC API validation into your deployment pipeline to catch specification errors before they reach production.

Using the Example Script

The library includes a ready-to-use validation script in examples/validate_ogc_api_server.py:

# Clone the repository
git clone https://github.com/francbartoli/ogcapi-registry.git
cd ogcapi-registry

# Install dependencies
uv sync --all-extras --dev

# Run validation against a real OGC API server
uv run python -c "
from examples.validate_ogc_api_server import validate_server, print_report
report = validate_server('https://demo.ldproxy.net/daraa')
print_report(report)
"

The script will:

1. Fetch the OpenAPI document from /api
2. Fetch conformance classes from /conformance
3. Analyze conformance coverage
4. Validate against OGC API requirements
5. Print a detailed report with errors by severity

Custom CI/CD Script

#!/usr/bin/env python
"""validate_ogc_server.py - CI/CD validation script"""

import sys
import httpx
from ogcapi_registry import (
    OpenAPIClient,
    validate_ogc_api,
    parse_conformance_classes,
)


def validate_server(base_url: str) -> bool:
    """Validate an OGC API server's OpenAPI document."""

    # 1. Fetch conformance classes
    response = httpx.get(f"{base_url}/conformance")
    response.raise_for_status()
    conformance_uris = response.json().get("conformsTo", [])

    if not conformance_uris:
        print("ERROR: No conformance classes declared")
        return False

    conformance_classes = parse_conformance_classes(conformance_uris)
    print(f"Found {len(conformance_classes)} conformance classes")

    # 2. Fetch and validate OpenAPI document
    client = OpenAPIClient()
    openapi_doc, metadata = client.fetch(f"{base_url}/openapi")

    print(f"Validating OpenAPI {openapi_doc.get('openapi', 'unknown')}")

    # 3. Run OGC API validation
    result = validate_ogc_api(openapi_doc, conformance_classes)

    # 4. Report results
    print(f"\n{'='*50}")
    print(f"Validation Result: {'PASSED' if result.is_valid else 'FAILED'}")
    print(f"{'='*50}")

    if result.critical_errors:
        print(f"\nCritical Errors ({len(result.critical_errors)}):")
        for err in result.critical_errors:
            print(f"  - {err['path']}: {err['message']}")

    if result.warnings:
        print(f"\nWarnings ({len(result.warnings)}):")
        for warn in result.warnings:
            print(f"  - {warn['path']}: {warn['message']}")

    summary = result.get_summary()
    print(f"\nSummary: {summary['critical']} critical, "
          f"{summary['warning']} warnings, {summary['info']} info")

    # Return True only if no critical errors
    return result.is_compliant


if __name__ == "__main__":
    server_url = sys.argv[1] if len(sys.argv) > 1 else "https://demo.pygeoapi.io/master"

    success = validate_server(server_url)
    sys.exit(0 if success else 1)

Use in GitHub Actions:

- name: Install ogcapi-registry
  run: pip install ogcapi-registry

- name: Validate OGC API Compliance
  run: python validate_ogc_server.py ${{ env.SERVER_URL }}

Or using the library's example script directly:

- name: Checkout ogcapi-registry
  uses: actions/checkout@v4
  with:
    repository: francbartoli/ogcapi-registry
    path: ogcapi-registry

- name: Install uv
  uses: astral-sh/setup-uv@v4

- name: Install dependencies
  run: cd ogcapi-registry && uv sync --all-extras --dev

- name: Validate OGC API Server
  run: |
    cd ogcapi-registry
    uv run python -c "
    from examples.validate_ogc_api_server import validate_server, print_report
    report = validate_server('${{ env.SERVER_URL }}')
    print_report(report)
    exit(0 if report['status'] in ['valid', 'compliant'] else 1)
    "

Supported OGC API Standards

Advanced Usage

Custom Validation Strategy

from ogcapi_registry import ValidationStrategy, OGCAPIType, ValidationResult

class MyCustomStrategy(ValidationStrategy):
    """Custom validation for organization-specific requirements."""

    api_type = OGCAPIType.FEATURES

    def validate(self, document, conformance_classes):
        errors = []

        # Add custom validation logic
        if "/health" not in document.get("paths", {}):
            errors.append({
                "path": "paths",
                "message": "Missing /health endpoint (org requirement)",
                "severity": "warning",
            })

        return ValidationResult.success() if not errors else ValidationResult.failure(errors)

Async Validation

import asyncio
from ogcapi_registry import AsyncOpenAPIClient, validate_ogc_api

async def validate_multiple_servers(urls: list[str]):
    client = AsyncOpenAPIClient()

    async def validate_one(url):
        doc, _ = await client.fetch(f"{url}/openapi")
        # ... fetch conformance and validate
        return url, result

    results = await asyncio.gather(*[validate_one(url) for url in urls])
    return dict(results)

Documentation

Full documentation: https://francbartoli.github.io/ogcapi-registry/

Development

# Clone and install
git clone https://github.com/francbartoli/ogcapi-registry.git
cd ogcapi-registry
uv sync --all-extras --dev

# Run tests
uv run pytest -v

# Run linting
uv run ruff check src/ tests/
uv run mypy src/ogcapi_registry

License

MIT